You’re standing on the surface of the earth. you walk one mile south, one mile west, and one mile north. you end up exactly where you started. where are you?

If you are standing directly on the north pole and you walk one mile south, then one mile west, then one mile north, you will arrive back at the north pole.
The North Pole
Although there are a few solutions to this riddle, this is the most common

So you know what happened and so it doesn’t repeat it’s self